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A001661 as a simple table

n a(n)
2 128
3 12758
4 5134240
5 67898771
6 11146309947
7 766834015734

[128,12758,5134240,67898771,11146309947,
 766834015734]

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Last modified October 30 15:17 EDT 2014. Contains 248819 sequences.